George frederick wynne



Y (No Model.)

G. lP.WY1\I1\IE. V

ROCK DRILL.

No. 814.213,f- Patented Mar.` v17., 1885.

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' UNTTED STATES PATENT OFFICE,

DENBIGH, .ASSIGNOR TO THOMAS ROWLAND JORDAN AND ROBERT E.

coMMANs, OE LONDON, ENGLAND.

y ROCK-DRILL.

SPECIFICATION forming part of Letters Patent VNo. 314,213, dated March 1,7, 1885.

Application filed December 13, ISH.

To all whom t rrr/ay concern:

Be it known that I, GEORGE FREDERICK 1WYNNE, a subject of the Queen of Great Britain, residing at Minera, near Wrexham, in the coun'tyof Denbigh, and Kingdom of Great Britain, have invented certain new and useful Improvements in Rock-Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention', such as will enable others skilled inthe art to which it appertains to make and use the same.

This invention relates to improvements in double-acting rock-boring machines or drills whereby the compressed air or steam is alternately admitted into opposite ends of the cylinder through ports and passages in the gland and piston-rod.

In carrying out my inventionv I employ a cylinder of suitable length, near the center of which is located an annular exhaust-port, and into which is fitted a piston the piston-rod of which passes through a gland of peculiar construction, as hereinafter described. Inside the before mentioned gland is an annular groove which is in communication with the supply-pipe, and in which the motive iiuid is always pressing around the piston rod. From the top of the piston and piston-rod a hole is bored centrally, and at a suitable point in the piston-rod holes are drilled radially, communicating with it, forming the passage to the top end of the cylinder, and longitudinal recesses are also formed on a portion of the periphery of the upper end of the piston-rod, said recesses forming the passage for the motive fluid to the lower end of the cylinder.

By this construction and arrangement, if 'theI piston be in such a position that the radial holes in the piston-rod are in communication with the annular space in the gland, the motive iuid will pass into the top end of the cylinder, and will force it down until the before mentioned longitudinal recesses are brought into communication with the annular space in the gland, so as to raise it in the opposite direction Ato that hereinbefore described, and so on.

The exhaust takes place from the top end (No model). Patented inrEnglaud February 2l, 1882, No. 903.

of the cylinder through the radial openings in the piston-rod as these in the downward 5o movementV of the piston come outside the before-mentioned gland, and from the bottom end of the' cylinder through the annular port of very large area,

The twisting arrangement, the cradle, feed- 55 screw, and tool-holder are substantially the same as those now generally employed for this class of rocleboring machines.

In order to enable my invention to be better understood, I will proceed to describe the 6o same by reference to the accompanying drawings, in which Figure I is a longitudinal section of a rockdrill constructed according to my invention, and Fig. 2 is a transverse section of the saine 65 through the gland at Y Z, Fig. l.

Similar letters in both the figures represent similar parts.

Ois the cylinder, P the piston, R the pistonrod, and H the gland. The piston l? and pis- 7o ton-rod E are bored out centrally at C; and B are the radial openings made from the outside of the piston-rod R, and communicating withthe said central boring, C. Fare the longitudinal recesses made in the upper end of 75 the piston-rod. A is the annular groove or space in the gland H, and A is the entrance for the motive duid.

The operation is as follows: If the compressed air or other fluid be admitted through 8J A into the annular space A' in' the gland II, and the piston l? be moved in the cylinder toward D, so that the radial openings B are brought into communication with the annular yspace A', the motive iiuid'will be admitted 85 through the 'central passage, C, to the top side of the piston, and will cause the piston to move in the direction of the arrow z until the longitudinal recesess F are brought into communication with the before-described 9o annular space A', when the motive Iiuid will be admitted to the bottom side of the piston, and will cause it to move upward in the direction of D. The exhaust takes place through the annular port G in the cylinder as it be- 95 comes uncovered by the piston going back- Ward and 'forward over it. The exhaust also takes place through the radial openings B in the piston-rod as they, inthe downward movement of the piston, come outside of the gland I-I. 5 Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a rock-drill, the combination,with the cylinder O, having the annular exhaustport 1o G, of the hollow piston P, hollow piston-rod R, having external longitudinal recesses, E, and radial openings B, and the gland H, having the annular space A, communicating with the motivenluid-supply pipe, substantially as 15 shown and described.

GEORGE FREDERICK WYNNE.

In presence of WILLIAM POTTER, R. POTTER,

' Both of Wrexham'. 

